Solid-State NMR Studies of the Structure and Reactivity of Metakaolinite

Authors

  • Dr. João Rocha,

    1. Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW (UK)
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  • Jacek Klinowski

    Corresponding author
    1. Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW (UK)
    • Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW (UK)
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  • We are grateful to E.C.C. International Limited for support and for providing kaolinite samples, to the University of Aveiro for support and to Dr. G. Engelhardt, Dr. J. M. Adams and Dr. M. W. Anderson for discussions.

Abstract

Si atoms in various environments, as well as tetra-, penta-, and hexacoordinated AI atoms, have been observed in metakaolinite by high-resolution solid-state NMR spectroscopy. Their ratios depend upon the calcination temperature. Studies have shown that the most reactive metakaolinite (calcination temperature 480-500 °C) is associated with a minimum concentration of hexacoordinate and a maximum concentration of tetra- and pentacoordinate Al.

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